This is a very hard fight to predict because of Bader's resume. He's beaten some great strikers but also been KO'd by great strikers. I know he just destroyed Mitrione, but Fedor is light years better on the ground than Mitrione. However, Fedor is also chinny at 42 and Bader can punch too.
The real question is how will Bader wrestle with a 230-240 lb. Heavyweight with a good ground game? We haven't seen it yet because he only has two fights at HW and one was against King Mo who is a LHW and Mitrione who is notoriously poor on the ground. Correct me if I am wrong, but I am assuming the heaviest guys he's fought were Rumble, Rampage, and Tito? I'm assuming all of those guys entered the Octagon at around 225 or so. Fedor is bigger than than them and probably stronger.
I either see Fedor KO'ing him in the 1st round or Bader stopping him in the 2nd/3rd. Bader knows modern day Fedor is a brawler and will throw bombs. I expect him to play it safe in the 1st round and not use too much energy. Fedor will need to focus on his conditioning because he will certainly end up on his back in this fight. I favor Bader but this is a strange fight.